Air-heater for stoves and furnaces



L. 'D. WEST.

AIR HEATER FOR STOVES AND FURNACES. APPLICATION FILED JAN- 1. 1920.

1,390.947. Patentedsept- 13,1921. 3 SHEETS-SHEET 1.

1 25 f r"\ i 4 4 4 (a 4; 2/ w "il 4/ Mount o L. 0. WEST.

AIR HEATER FOR STOVES AND FURNACES. APPLICATION FILED JAN. I, 1920.

1,390,947. Patented ep 13,1921.

3 SHEETS-SHEET 3.

citizen of the United States, residin UNITED STATES PATENT OFFICE.

LEONIDAS D. WEST,- OF DENVER, COLORADO.

AIR-HEATER FOR STOVES AND FURNACES.

Specification of Letters Patent. Patented Sept. 13, 1921.

Application filed January 7, 1920. Serial No. 350,054.

To all whom it'may concern:

Be it known that I, LEONIDAS D. WEST, a at Denver, in the county of Denver and tate of Colorado, have invented certain new and useful Improvements in Air-Heaters for Stoves and Furnaces; and I do declare the heat units.

One object of the invention is to provide an extremelysimple and inexpensive device for the above named purpose, which maybe manufactured and marketed to advantage,

and applied to numerous forms of stoves and furnaces Without the necessity ofmaking any alterations therein.

Another object is to provide an attachment of the class set forth which may be used to eat advantage with a supplemental air-heating casing, to receive .pre-

heated air from the latter, superheating and highly expanding such air, and discharge it in 'ets into the fire-box or the like.

ith the foregoing and minor objects in view, the invention resides in the novel construction and arrangement of parts hereinafter described and claimed, the descriptive matter being supplemented by the accom pan ing drawings. a

Figure 1 is a plan view of oneof theimproved air, heaters used in connection with a sup lemental air-heater mounted on a furnaee oor. p v

Fig. 2 is an inner side elevation of the parts shownin Fig. 1.

Fig. 3 is an edge view.

Fig. 4 is a vertical section on the plane indicated by line 4+4 of Fig. 2.

Fig. 5 is a perspective view of the ribbed plate forming a part of the air-heater.

F1 dis a perspective view of the cover as, for the ribbed plate shown in Fig; 5.

Fig 7 a perspective view showing one of the air heaters attached to a "stove lid.

escapes, carrying with it valuable Fig. 8 is a sectional view on the plane indicated by the line 8--8 of Fig. 7

Fig. 9 is a bottom plan view of the ribbed plate shown in Figs. 7 and 8.

Fig. 10 is a transverse section as indicated by the lines 1010 of Figs. 8 and 9. Fig. 11 is an elevation showing air heaters of different shape than those illustrated in the other views.

In carrying out my invention, I employ a casing 1 adapted to be exposed to heat within a stove or furnace, said casing having an air inlet neck 2 whose outer end is adapted to abut and be closed by a stove lid 3 as shown inFigs. 7 to 10, by one wall 4 of an auxiliary air-heating casing 5 as depicted in Figs. 1 to 4, or by any other appropriate stove or furnace part. In all instances, this part will be provided with'one or more air inlet perforations 6. A web 7 extends across the inner end of the neck 2 and is provided" withrestricted openings 8 through which the air must ass from said neck into the casing 1. This perforated web coacts with the neck and the stove; or furnace part against whichsaid neck is clamped, to produce an auxiliary air-heating chamber 9 in which preheating and considerable expansion ofthe air takes place before it enters the casing 1, and since the perforations 8 are rather small the passage of air from the chamber 9 into the casing 1 is retarded to such an extent as to insure heating of the air to a high temperature and high expension of such air before it enters the casing 1. Within this casing, due to a novel arrangement of ribs, the air is superheated, and is in a highly heated andexpanded state when it is finally discharged into the fire-box or the like.

In the preferred embodiment of my invention, I construct the casing 1 of a ribbed plate 10 and alcover plate 11, both of which are preference of substantially Y shape, and f dr future reference, I have designated the shank of the plate 10 by numeral 12, and its diverging arms by the character 13. The edges of all of these parts are provided with a continuous lateral flan e 14 which may be provided at the ends 0 the arms 13 with a plurality of small air outlet notches 15 as seen in Figs. 2 and 5, or with wider air inlets 15 as in Figs. 7 and 9. When the latter construction is used air deflecting flanges 16 preferably extend outwardly from the flange 14, adjacent the openings 15 as seen clearly in Figs. 7, 8 and 9. The air enters the casing 1 through the perforations 8 and before reaching the outlets or 15 is forced to travel along tortuous courses which insure maximum heating thereof.

The air courses above referred to are formedin asi'mple manner by casting ribs on the plate 10, the arrangements of ribs being illustrated most clearly in Figs. 5 and 9. Two longitudinal ribs 17 extend along 1 the shank 12 and arms 13, with their ends tendingfinwardly between the outer ends 20 offthe ribs 17 and the portions of the flange 14 atgthe inner edges of, the aforesaid arms 13. The neck 2 may be located to discharge theair in the space partly surrounded by the ribs 17, and 18 as. shown in Fig. 9, or

may be positioned, at the free end of the shank12 as disclosed in Fig. 5. In either case, the highly. heated and expanded air from the perforations. 8 must flow through the tortuous channels between the several ribsas indlcated by the arrows, and during its travel, the air will. be highly heated belets 15 or 15 fore it is' finally discharged through the out- The cover plate 11 is provided, except at the ends and inner edges of its arms, with parallel ribs '21 which straddle the flange 14.11) properly position the cover plate, and

1 addition to performing this function, the lnnermost of said ribs 21, serves to carry heat inwardly into the hot air channels, to produce further efficiency. This last named effect may be increased also. by providing the cover plate 11 with oneor more additionali ribs 22, and I may also equip said plate with small projections 23 to extend i'nto'the air outlets, if desired, whereby to split,, u-p the discharged. air into a plurality Ighreferab y uset o. man and 24 for SQQIiriHgQth'e coyen'plate 11, in place, andthe iboll j 2. P ef r bly p sse longitudinally through the neckf9 toclamp the outer v end neckagainst thestovelid 3, the wall trot against any. he suita sst ve nacepart: vWhen'the device is used in connection, with a, kitchen range or other stove, the neck, 2, 1s1qlampedfdire'ctly against one Hof the 1idsf,as;seen inl-Figs. 7, 8 and 10, but

'w njitfisgemployedinjconnection with a f1; as, '...-rgr .fer ha e: upp e n he er; 5 used, and] thisheater may be a ear. 25 as shown in Figs. 1 to 1, or to any other suitable part. Such part however, will in all instances have an appropriate air-inlet such as 26, which may well be controlled by a suitable damper 27.

The casing 5 is preferably of the shape shown in the drawing, with one side abutting and closed by the door or the like 25, while its opposite side. here indicated at 4, is inclined downwardly and inwardly to similarly position the casing 1.

I attach great importance to the provision of the perforated web 7 which courts with other parts in forming the air preheating chamber 9, since I have found by actual use that these parts serve to choke down the inrush of air and thus cause more effective heating and expansion thereof. I also consider the simple construction of the entire device as highly important, since it permits easy and inexpensive manufacture and marketing, and well adapts the device to stoves and furnaces of numerous kinds, without the necessity of making any alterations whatever in their construction, only requires that one or more holes be drilled. The supplemental air-heater 5 as constructed and associated with the heater 1 is of great importance, since it insures a large reserve supply of warm air, but I make no: broad claim to the combination of the supplemental air heater and final air heater, since this is old in the art.

Since excellent results may be obtained from the several details shown and described, they may well be followed, but I wish it understood that within the scope of the invention as claimed, numerous minor changes may well be made.

I claim:

1. A device of the class described comprising a plate having a shank and two arms diverging therefrom in the same plane therewith, the edge of said plate having a continuous flange provided with air outlet openings at the ends of said arms; said shank and the contiguous arm portions having longitudinal ribs terminating short of their outer ends and, parallel with the adjacent portions of said flange; transverse ribs joining the intermediate parts of said longitudinal ribs with the portions of said flange at the inner ends of said arms, and angular transverse ribs extending inwardly from the portions of said flange at the outer ends of said arms; said angular ribs extending along said arms between one end of said longitudinal ribs and the parts of said flange at the inner edges of said arms, and terminating in spaced relation with said. first named transverse ribs; a cover plate secured. against the edges of said flange and ribs, and an air inlet through the aforesaid shank for supplying air to the several channels between the ribs.

2. A device of the class described comprising a plate having a shank and two arms diverging therefrom in the same plane therewith, the edge of said plate having a continuous flange provided with air outlet openings at the ends of said arms; said shank and the conti ous arm portions having longitudinal ri terminating short of their outer ends and parallel with the ad jacent portions of said flange; transverse ribs joining the intermediate parts of said longitudinal ribs with the portions of said flange at the inner ends of said arms, and angular transverse ribs extending inwardly from the portions of said flange at the outer ends of said arms; said angular ribs extendin along said arms between one end of sai longitudinalribs and the parts of said flange at the inner edges of said arms,

and terminating in spaced relation with said. first named transverse ribs; a cover plate secured against the edges of said flange and ribs, an air inlet neck extending from said shank, means for clamping the outer end of said neck against an apertured stove lid or other furnace of stove part, and a perforated air'retarding Web across said air inlet neck.

3; A structure as specified in claim 1; together with projections on said cover plate extending into said air outlet openings.

Signed at Denver, in the county of Denver and State of Colorado, this 31st day of December, 1919.

LEONIDAS D. WEST.

Witnesses:

MILTON H. MARK, M. MoIm'm. 

